Swiss police inadvertently discovered a large marijuana plantation hidden inside a field of corn while using Google Earth to search for the address of two farmers suspected of being part of an alleged drug ring.

Norbert Klossner, who is the head of Zurich police’s special narcotics unit, said “It was an interesting chance discovery.” Police ended up arresting 16 people during the raid and seized 1.2 US tons of marijuana at the two-acre plantation.

The drug ring is alleged to have sold up to 7.7 US tons of hashish and marijuana between the years of 2004 and 2008. The drug operation is estimated to have raked in up to 10 million francs (8.66 million USD) a year.